[PATCH 11/19] rnbd-srv: remove struct rnbd_dev_blk_io

[Christoph Hellwig <hch@xxxxxx>]

Only the priv field of rnbd_dev_blk_io is used, so store the value of
that in bio->bi_private directly and remove the entire bio_set overhead.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/block/rnbd/rnbd-srv-dev.c |  4 +---
 drivers/block/rnbd/rnbd-srv-dev.h | 13 ++-----------
 drivers/block/rnbd/rnbd-srv.c     | 27 ++++-----------------------
 drivers/block/rnbd/rnbd-srv.h     |  1 -
 4 files changed, 7 insertions(+), 38 deletions(-)

diff --git a/drivers/block/rnbd/rnbd-srv-dev.c 
b/drivers/block/rnbd/rnbd-srv-dev.c
index 98d3e591a0885..c5d0a03911659 100644
--- a/drivers/block/rnbd/rnbd-srv-dev.c
+++ b/drivers/block/rnbd/rnbd-srv-dev.c
@@ -12,8 +12,7 @@
 #include "rnbd-srv-dev.h"
 #include "rnbd-log.h"
 
-struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
-                              struct bio_set *bs)
+struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags)
 {
        struct rnbd_dev *dev;
        int ret;
@@ -30,7 +29,6 @@ struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t 
flags,
 
        dev->blk_open_flags = flags;
        bdevname(dev->bdev, dev->name);
-       dev->ibd_bio_set = bs;
 
        return dev;
 
diff --git a/drivers/block/rnbd/rnbd-srv-dev.h 
b/drivers/block/rnbd/rnbd-srv-dev.h
index 1a14ece0be726..2c3df02b5e8ec 100644
--- a/drivers/block/rnbd/rnbd-srv-dev.h
+++ b/drivers/block/rnbd/rnbd-srv-dev.h
@@ -14,25 +14,16 @@
 
 struct rnbd_dev {
        struct block_device     *bdev;
-       struct bio_set          *ibd_bio_set;
        fmode_t                 blk_open_flags;
        char                    name[BDEVNAME_SIZE];
 };
 
-struct rnbd_dev_blk_io {
-       struct rnbd_dev *dev;
-       void             *priv;
-       /* have to be last member for front_pad usage of bioset_init */
-       struct bio      bio;
-};
-
 /**
  * rnbd_dev_open() - Open a device
+ * @path:      path to open
  * @flags:     open flags
- * @bs:                bio_set to use during block io,
  */
-struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
-                              struct bio_set *bs);
+struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags);
 
 /**
  * rnbd_dev_close() - Close a device
diff --git a/drivers/block/rnbd/rnbd-srv.c b/drivers/block/rnbd/rnbd-srv.c
index 6d228af1dcc35..ff9b389976078 100644
--- a/drivers/block/rnbd/rnbd-srv.c
+++ b/drivers/block/rnbd/rnbd-srv.c
@@ -116,9 +116,7 @@ rnbd_get_sess_dev(int dev_id, struct rnbd_srv_session 
*srv_sess)
 
 static void rnbd_dev_bi_end_io(struct bio *bio)
 {
-       struct rnbd_dev_blk_io *io = bio->bi_private;
-
-       rnbd_endio(io->priv, blk_status_to_errno(bio->bi_status));
+       rnbd_endio(bio->bi_private, blk_status_to_errno(bio->bi_status));
        bio_put(bio);
 }
 
@@ -131,7 +129,6 @@ static int process_rdma(struct rnbd_srv_session *srv_sess,
        struct rnbd_srv_sess_dev *sess_dev;
        u32 dev_id;
        int err;
-       struct rnbd_dev_blk_io *io;
        struct bio *bio;
        short prio;
 
@@ -152,7 +149,7 @@ static int process_rdma(struct rnbd_srv_session *srv_sess,
        priv->sess_dev = sess_dev;
        priv->id = id;
 
-       bio = bio_alloc_bioset(GFP_KERNEL, 1, sess_dev->rnbd_dev->ibd_bio_set);
+       bio = bio_alloc(GFP_KERNEL, 1);
        if (bio_add_page(bio, virt_to_page(data), datalen,
                        offset_in_page(data)) != datalen) {
                rnbd_srv_err(sess_dev, "Failed to map data to bio\n");
@@ -160,12 +157,8 @@ static int process_rdma(struct rnbd_srv_session *srv_sess,
                goto bio_put;
        }
 
-       io = container_of(bio, struct rnbd_dev_blk_io, bio);
-       io->dev = sess_dev->rnbd_dev;
-       io->priv = priv;
-
        bio->bi_end_io = rnbd_dev_bi_end_io;
-       bio->bi_private = io;
+       bio->bi_private = priv;
        bio->bi_opf = rnbd_to_bio_flags(le32_to_cpu(msg->rw));
        bio->bi_iter.bi_sector = le64_to_cpu(msg->sector);
        bio->bi_iter.bi_size = le32_to_cpu(msg->bi_size);
@@ -260,7 +253,6 @@ static void destroy_sess(struct rnbd_srv_session *srv_sess)
 
 out:
        xa_destroy(&srv_sess->index_idr);
-       bioset_exit(&srv_sess->sess_bio_set);
 
        pr_info("RTRS Session %s disconnected\n", srv_sess->sessname);
 
@@ -289,16 +281,6 @@ static int create_sess(struct rtrs_srv_sess *rtrs)
                return -ENOMEM;
 
        srv_sess->queue_depth = rtrs_srv_get_queue_depth(rtrs);
-       err = bioset_init(&srv_sess->sess_bio_set, srv_sess->queue_depth,
-                         offsetof(struct rnbd_dev_blk_io, bio),
-                         BIOSET_NEED_BVECS);
-       if (err) {
-               pr_err("Allocating srv_session for path %s failed\n",
-                      pathname);
-               kfree(srv_sess);
-               return err;
-       }
-
        xa_init_flags(&srv_sess->index_idr, XA_FLAGS_ALLOC);
        INIT_LIST_HEAD(&srv_sess->sess_dev_list);
        mutex_init(&srv_sess->lock);
@@ -747,8 +729,7 @@ static int process_msg_open(struct rnbd_srv_session 
*srv_sess,
                goto reject;
        }
 
-       rnbd_dev = rnbd_dev_open(full_path, open_flags,
-                                &srv_sess->sess_bio_set);
+       rnbd_dev = rnbd_dev_open(full_path, open_flags);
        if (IS_ERR(rnbd_dev)) {
                pr_err("Opening device '%s' on session %s failed, failed to 
open the block device, err: %ld\n",
                       full_path, srv_sess->sessname, PTR_ERR(rnbd_dev));
diff --git a/drivers/block/rnbd/rnbd-srv.h b/drivers/block/rnbd/rnbd-srv.h
index e5604bce123ab..be2ae486d407e 100644
--- a/drivers/block/rnbd/rnbd-srv.h
+++ b/drivers/block/rnbd/rnbd-srv.h
@@ -23,7 +23,6 @@ struct rnbd_srv_session {
        struct rtrs_srv_sess    *rtrs;
        char                    sessname[NAME_MAX];
        int                     queue_depth;
-       struct bio_set          sess_bio_set;
 
        struct xarray           index_idr;
        /* List of struct rnbd_srv_sess_dev */
-- 
2.30.2